We talked about the .300 AAC BLK (7.62×35) last week and for a comparison we are looking at the 7.62x40WT
The New 7.62x40WT uses the 5.56x45NATO cartridge case which is shorten and necked up to the .30 (7.62) caliber projectile. To convert the standard 5.56NATO AR-15 platform rifle, a barrel change is required and a special Wilson-modified version of Lancer’s L5 AWM polymer magazine (The L5 AWM is a 5.56NATO magazine).
The 7.62×40 WT will function with standard unmodified Lancer L5 magazines if loaded to 17 (in a 20 round) or 24 rounds (in a 30 round), the Wilson Combat modified Lancer L5 AWM magazines with loaded 18/19 in a 20 round or 28/29 in the 30 round capacity magazines. The modified magazines were redesigned so that it may function more reliably.
The 300 BLK has been optimized for subsonic and suppressor use, but can work with supersonic loads. The 7.62x40WT is designed for supersonic.
We contacted Wilson Combat about if the 7.62x40WT has been SMAAI approved at this time but as of July 2011 They have not but are working towards that.
Caliber: .308 Win (7.62×51 NATO)
Barrel Length: 16.1″
Bore:Chromed, 4 Grooves, 1-12″ RH Twist
Front Sight: Flip-Up, Adjustable Post for Elevation
Rear Sight: Flip-Up, Adjustable for both Windage and Elevation
Extended Length: 37.5
Collapsed Length: 34.24
Weight: 9.4 lbs..
Action: Semi-Auto, direct Gas System, Locking Bolt
Finish: Matte Black
- 1-Piece Upper Receiver
- Full Floated Barrel
- Bayonet Lug and Flash Hider
- Ambidextrous Controls
- Accepts Mil-Spec 5.56 Colt Uppers
Colt has a new rifle that they are releasing onto the civilian market in August 2011. The Colt SP901 is an ambidextrous, multicaliber weapon fires the 7.62NATO rounds and with a simple change to a standard AR-15 mil-spec upper can fire the 5.56NATO round. the rifle has a free-floating barrel to help keep high accuracy.
The SP901 essentially the civilian version of the Armed forces Colt defense CM901 with the same features, minus the automatic fire capability.
While the CM901 can operate using a piston, gas-impingement system or hybrid of the two, the SP901 will come with a direct gas system.
Colt is manufacturing an adapter for the standard .223/5.56NATO AR-15 STANAG magazines allowing for the rifle to fire a multiple range of calibers such as (a partial list)
- 7mm Magnum
- .458 Winchester Magnum.
- 20 Practical
- 5.56mm NATO
- 6.5mm Grendel
- 6.8 Remington SPC
- 7mm TCU
- .300 Whisper
- .338 Lapua
- .40 S&W
- .45 ACP
- .450 “Thumper”
- .458 Socom
- .499 LWR
- .50 Beowulf
- .50 BMG
- .300 AAC BLK
- 7.62×40 WT
- .358 Gremlin
- 5.7×28 FN
- .410 Shotgun
Click here for an UPDATE (September 8, 2011)
I read about the The .300 BLK by AAC (Advanced Armament Corp.) around September 2010 and have been watching the reviews of this weapon before I wrote a post on it
The round was designed by AAC in 2010 and designed around the M4 Carbine platform (short barrel AR-15 rifle) One weapon and caliber replacing the standard M4 This upper receiver group uses a standard M4 bolt and Bolt Carrier Group. This allows Military or Law Enforcement to take the standard M4 and just replace the barrel to the new .300 AAC blackout.
The project goals were:
- Create a reliable compact 30-caliber solution for AR platform
- Utilize existing inventory magazines while retaining their full capacity
- Create the optimal platform for sound and flash suppressed fire
- Create compatible supersonic ammo that matches 7.62×39mm ballistics
- Provide the ability to penetrate barriers with high-mass projectiles
- Provide all capabilities in a lightweight, durable, low recoiling package
Reasons the 7.62×39 was not considered:
Extreme cartridge taper
• Reduces reliability of feeding in AR Magazines
• Reduces Magazine capacity
• Cartridge taper induces considerably higher bolt thrust-
exacerbating the AR Bolt’s weaknesses
• Requires a larger Bolt Face which reduces Bolt Locking Lug strength-
exacerbating the AR Bolt’s weaknesses
Limited projectile selection
• 0.311″ diameter not a common option in most modern bullets
[As stated on the .300 AAC Blackoutwebsite]
The .300 Blackout uses standard AR-15 magazines and with cartridge size allows for the capacity of the magazine to be unchanged in round count.
The 300 AAC BLACKOUT 123 grain ammunition matches the ballistics of the 7.62x39mm AK and has 37% more energy than 5.56mm M855 when either are fired through a short barrel.
AAC commented saying “its hard to support a wildcat round (such as the .300 whisper) when load data is all over”.
The 300 AAC BLACKOUT upper receiver is compatible with all AR-15 lowers
300 AAC BLACKOUT was approved by SAAMI on January 17, 2011.(Sporting Arms and Ammunition Manufacturers’ Institute)
- .300 BLK is going for approximately $20 for 20 rounds ($1 per round)
- 7.62×39 is going for approximately $5 for 20 rounds ($0.25 per round)
- .223/5.56NATO is going for approximately $5 for 20 rounds ($0.25 per round)
L-R The 300 AAC Blackout plastic tipped, left, compared to 300 AAC BLACKOUT 125 match, 300 AAC BLACKOUT 220 subsonic, 5.56mm, and 7.62×39mm.
As I was enjoying my Independence Day with a few of my close friends we started talking shop and about the weapons we had been working with lately when someone for the group near us over heard us talking about the AR-15 platform and they came over and asked what does the AR stand for? and he told us he had heard it stood for “Assault Rifle” and and we went on explaining where AR came from.
We had a guest posted planned for today but had a problem with getting it sent and up on the site in time so we will just keep working on that and hope for later on this week. so as I rushed to make sure there was a post up for today I thought back on the misinformation that had been given out to our new friend and new reader of the blog and figured today would be a good day for clearing up some misnomers
AR (AR-15, AR-7, AR-10…): The “AR” designation comes from the name of the company that produced the firearm – Armalite. It is a common misconception that it stands for “assault rifle.”
Assault Rifle: This is one of the terms that seems to have shed some bad light on AR-15 weapons. The definition of Assault Rifle that stand out the most is an Assault Rifle must have selective fire meaning you have a switch on the weapon that lets the shooter go from safety to semi auto to 3 round burst or full auto. meaning that one pull of the trigger lets the weapon function in one of the selected modes.
The standard AR-15 model that is sold is only Safe and Semi-auto fire.
Magazine vs. clip:
A magazine is an ammunition storage and feeding device within or attached to a repeating firearm.
A clip is a device that is used to store multiple rounds of ammunition together as a unit, ready for insertion into the magazine or cylinder of a firearm.
If you have a misnomer I didn’t write about and you would like to see it on the site please let us know.
Caliber: 6X35mm KAC
Rate of fire: Semi / Full Auto – 700 rpm
Magazine Type/ Capacity:Full Curved, 30 Rounds
WEIGHT (w/o MAGAZINE)
4 lbs. 5 oz. (8″) / 5lbs 2oz (10″
1.8 Kgs (20cm) / 2.3 Kgs (25cm)
LENGTH w/ STOCK RET.
17.5″ (8″) / 19.5″ (10″)
44cm (20cm) / 50cm (25cm)
LENGTH w/ STOCK EXT.
26″ (8″) / 28″ (10″)
66cm (20cm) / 71cm (25cm)
I checked with Knight’s to see if they were planning on releasing the semi-auto civilian model and at this time they are not.
The weapon has ambidextrous controls, It operates on a proprietary dual gas piston system and uses a full curved magazine. (at this time I have been unable to find out if it uses proprietary 6x35mm magazines or if it will use the standard AR platform .223/5.56NATO magazine.)
The KAC PDW (Personal Defense Weapon) uses and was designed around the proprietary 6x35mm cartridge made by Knights Armament. It was designed as a weapon for aircraft crews, tank crews and truck drivers who did not need to carry a carbine but a small standby small arms weapon should they come under attack while not in transit. This weapons has high lethality of up to 300 meters.
The PDW with the 6x35mm has as much Kinetic energy as a 10 inch M4 carbine but has 50% less recoil than a standard M4 carbine. The KAC muzzle device is designed for weapon control, it eliminates muzzle climb and recoil, but not muzzle flash.
For all the the AR platform lovers who have seen just a small number of different configurations we have posted on this site here is another.
The FN P90 changed the design of their magazine to be on top of the weapon to keep the rifle in a small neat package to be a PDW but still allow for a large number of rounds to be loaded in the weapon.
The AR-57 upper simply replaces the standard 5.56/.223 upper and since the magazine is top mounted like the FN P90 keeps the weapon small while having the ability to to hold up to a 50 round magazine and not have a long magazine protruding from the weapon.
The magazine is the same as on the FN P90, depending on state and local laws for magazines modified magazine are available in 5 and 10 round set up.
L-R .17HMR, .22LR, .22MAG, 5.7x28mm
The Carbine 16” barrel set up weighs about 7.45lbs. unloaded and just over 8.5lbs loaded with a 50round magazine.
I wrote earlier this week about the AR platform and how much it can be reconfigured with seemingly limitless possibilities and there is really not other rifle on the market with such a versatile design out there.
Link-belted AR-15 Upper
MG-34 belted AR-15 Upper
Cross bow AR-15 Upper
P90 5.7×28 AR-15 Upper
AR-15 Lower (without butt stock)
.300 Blackout AAC AR-15 Upper
.50 BMG bolt action AR-15 Upper
We enjoy checking out rifles that have modified and if you would like to send us a picture or two with what you have done to your rifle we would like to post it on the site.
Be sure to join us on Facebook too.
For years I have had my own views and opinions on the M-16/M-4/AR-15 platform and the .223 Remington/5.56NATO rounds and have shot a fair number of different AR-15s.
I like the style of the weapon the look of the weapon and the ease of use.
Over the years I have seen how interchangeable the whole weapon system is and how a simple push of two pins can change the weapon from firing a .223 to a .50 BMG or a change of the bolt can make it fire a .22LR.
The AR platform can be configured to a good number of different calibers such as: .20 Practical, 22LR, 5.45×39, .223, 5.56NATO, 6.5mm Grendel, 6.8 SPC 7mm TCU, .300 Whisper, .300 Blackout, .338 Lapua, .40 S&W, 10mm, .45 ACP, .450 Bushmaster, .458 Socom,
.499 LWR, .50 Beowulf, .50 BMG, 7.62×39 just to name a few
The upper can be changed to make the weapon a shotgun, a belt-fed weapon, fire pistol rounds or just be reconfigured into a short pistol style weapon.
The versatility that the AR platform offers to the shooter is almost limitless and with more and more companies designing uppers and various other parts the next few years will make it limitless.
Calibers: .223 Remington
Weight unloaded: 3.2lbs
Barrel length: 9.2″
Magazine: AR-15 compatible detachable box magazines (STANAG Magazines)
Trigger pull: 5.5-7.5lbs
Muzzle velocity: 2600fps
Effective range: 400 m
The Kel-Tec PLR-16 (Pistol, Long Range) gives the shooter the a .223 rifle in a compact pistol/PDW design.
This weapon is small enough to be carried in a leg holster. The nice thing about the Kel-Tec is it lets the shooter use the same magazine in both an AR and this gun so you don’t have to buy all new magazines if you want more than what comes with the weapon.
The PLR-16 uses both the multi-lug rotating bolt design and breech-locking system similar to the AR-15 with a gas piston system like that of the AK-47 and M-14.
Here is a different fore grip for any rifle or shotgun that has a rail system on it.
Magpul states on that: “The AFG1 helps mitigate recoil and control the weapon, facilitating faster, more accurate follow-up shots.”
You can pick up your own Angled Fore Grip from our site under the Products we like tab.
L-R .300 Whisper, .223 Rem, .458 SOCOM
Rock River Arms AR platform chambered in .458 SOCOM
Caliber: .458 SOCOM
Barrel: 16” Chrome Moly Bull Barrel, 1:14 R Twist
Action: Semi-Auto AR Platform
Overall Length: 36”
Weight (empty): 7.6 pounds
Magazine: Standard .223 AR-15 Mags
SOCOM (Special Operations COMmand) contracted out for a new project which was brought on by a lack of power that the 5.56NATO cartridge has in the M4 and the M16.
SOCOM set a number of specific requirements for this new weapons system such as that the round must fit the standard M4 – M16 Platform and standard magazine and be capable of firing heavy-for-caliber projectiles at subsonic velocity using suppressors.
Marty ter Weeme, founder of Teppo Jutsu LLC. designed the cartridge in 2000 and Tony Rumore of Tromix, Inc was contracted to build the first .458 SOCOM rifle for use in February 2001.
In the developments phases, there were various other cartridges that were considered and proposed to the project sponsor, but rejected as not meeting all the requirements. The cartridges considered were 7.62x39mm, 9x39mm Grom, .450 Bushmaster, and .50 Action Express.
The .458 SOCOM uses the standard AR mag but due to it size does not allow for double stacking the rounds and subsequently only lets the mag hold a fraction of the rounds.
- 10 rounds Magazine designed for .223 will hold 3 rounds of .458 SOCOM
- 20 rounds Magazine designed for .223 will hold 7 rounds of .458 SOCOM
- 30 rounds Magazine designed for.223 will hold 10 rounds of .458 SOCOM
- 40 rounds Magazine designed for.223 will hold 13 rounds of .458 SOCOM
- The 90-round .223 drum can hold as many as 33-36 rounds of .458 SOCOM
- The 100 round beta mag will not work.
The AR-15 platform chambered in the .458 SOCOM gives a hunter a lightweight rifle with in heavy caliber that is durable and well suited for large game hunting.
I know I am going to catch some flack from writing about the ACR before I write about the FN-SCAR but I’m okay with that because no one requested the SCAR.
Caliber: 5.56 – 6.8 SPC II
Barrel: 10.5” – 14.5” – 16.5”
Trigger: Standard AR/M-16 trigger, 4.5 – 6lbs, Match trigger available
Magazine: Accepts MagPul PMAG and Mil-Spec M-16
Weight: 14.5 Weapon, Base rifle – 7lbs 14oz, Loaded w/ suppressor – 9lb 13oz
Length: 14.5 Weapon, W/o Suppressor, Stock folded – 25.75”, W/o Suppressor, Stock deployed – 32.625”, W/o Suppressor, Stock extended – 35.5”
Bushmaster has announced plans to make the ACR in 6.8 SPC and 7.62x39mm.
The ACR stands for Adaptive Combat Rifle and is easy to interchange the caliber of the rounds this rifle shoots with THREE simple changes, the barrel, the bolt carrier, and the magazine.
This weapon has a few variations such as barrel lengths and calibers, the color schemes, Stock made of polymer or metal, Lower receiver made of polymer or metal.
This system truly lives up to its name as an adaptive rifle for the end user.
(Update) On October 15, 2010 Bushmaster issued a recall of all ACR rifles instructing users to “Please immediately discontinue the use of your ACR rifle” along with instructions to contact customer support for an RMA. Bushmaster stated that the recall was issued due to “a possible firearms performance issue that may develop with a small number of ACR rifles” and goes on to state that “Bushmaster discovered a design flaw which could result in multiple rounds firing continuously when the trigger is pulled”. Bushmaster has stated that it will cover all of the costs associated with the repairs to the recalled rifles [wiki]